<!--
  Copyright (c) 2006-2013, JGraph Ltd
  
  Labels example for mxGraph. This example demonstrates the use of wrapping
  and clipping for HTML labels of vertices, truncating labels to fit the
  size of a vertex, and manually placing vertex labels and relative children
  that act as "sublabels".
-->
<html>
<head>
	<title>Hello, World! example for mxGraph</title>

	<!-- Sets the basepath for the library if not in same directory -->
	<script type="text/javascript">
		mxBasePath = '../src';
	</script>

	<!-- Loads and initializes the library -->
	<script type="text/javascript" src="../src/js/mxClient.js"></script>

	<!-- Example code -->
	<script type="text/javascript">

		// Program starts here. Creates a sample graph in the
		// DOM node with the specified ID. This function is invoked
		// from the onLoad event handler of the document (see below).
		function main(container)
		{
			// Checks if the browser is supported
			if (!mxClient.isBrowserSupported())
			{
				// Displays an error message if the browser is not supported.
				mxUtils.error('Browser is not supported!', 200, false);
			}
			else
			{
				// Creates the graph inside the given container
				var graph = new mxGraph(container);
				graph.setTooltips(true);
				graph.htmlLabels = true;
				graph.vertexLabelsMovable = true;
				new mxRubberband(graph);
				new mxKeyHandler(graph);
				
				// Do not allow removing labels from parents
				graph.graphHandler.removeCellsFromParent = false;
				
				// Autosize labels on insert where autosize=1
				graph.autoSizeCellsOnAdd = true;
				
				// Allows moving of relative cells
				graph.isCellLocked = function(cell)
				{
					return this.isCellsLocked();
				};
				
				graph.isCellResizable = function(cell)
				{
					var geo = this.model.getGeometry(cell);
					
					return geo == null || !geo.relative;
				};
				
				// Truncates the label to the size of the vertex
				graph.getLabel = function(cell)
				{
					var label = (this.labelsVisible) ? this.convertValueToString(cell) : '';
					var geometry = this.model.getGeometry(cell);
					
					if (!this.model.isCollapsed(cell) && geometry != null && (geometry.offset == null ||
						(geometry.offset.x == 0 && geometry.offset.y == 0)) && this.model.isVertex(cell) &&
						geometry.width >= 2)
					{
						var style = this.getCellStyle(cell);
						var fontSize = style[mxConstants.STYLE_FONTSIZE] || mxConstants.DEFAULT_FONTSIZE;
						var max = geometry.width / (fontSize * 0.625);
						
						if (max < label.length)
						{
							return label.substring(0, max) + '...';
						}
					}
					
					return label;
				};
				
				// Enables wrapping for vertex labels
				graph.isWrapping = function(cell)
				{
					return this.model.isCollapsed(cell);
				};
				
				// Enables clipping of vertex labels if no offset is defined
				graph.isLabelClipped = function(cell)
				{
					var geometry = this.model.getGeometry(cell);
					
					return geometry != null && !geometry.relative && (geometry.offset == null ||
						(geometry.offset.x == 0 && geometry.offset.y == 0));
				};
				
				// Gets the default parent for inserting new cells. This
				// is normally the first child of the root (ie. layer 0).
				var parent = graph.getDefaultParent();
								
				// Adds cells to the model in a single step
				graph.getModel().beginUpdate();
				try
				{
					var v1 = graph.insertVertex(parent, null, 'vertexLabelsMovable', 20, 20, 80, 30);

					// Places sublabels inside the vertex
					var label11 = graph.insertVertex(v1, null, 'Label1', 0.5, 1, 0, 0, null, true);
					var label12 = graph.insertVertex(v1, null, 'Label2', 0.5, 0, 0, 0, null, true);
					
					var v2 = graph.insertVertex(parent, null, 'Wrapping and clipping is enabled only if the cell is collapsed, otherwise the label is truncated if there is no manual offset.', 200, 150, 80, 30);
					v2.geometry.alternateBounds = new mxRectangle(0, 0, 80, 30);
					var e1 = graph.insertEdge(parent, null, 'edgeLabelsMovable', v1, v2);

					// Places sublabels inside the vertex
					var label21 = graph.insertVertex(v2, null, 'Label1', 0.5, 1, 0, 0, null, true);
					var label22 = graph.insertVertex(v2, null, 'Label2', 0.5, 0, 0, 0, null, true);
				}
				finally
				{
					// Updates the display
					graph.getModel().endUpdate();
				}
			}
		};
	</script>
</head>

<!-- Page passes the container for the graph to the program -->
<body onload="main(document.getElementById('graphContainer'))">

	<!-- Creates a container for the graph with a grid wallpaper -->
	<div id="graphContainer"
		style="position:absolute;top:0px;left:0px;overflow:hidden;width:100%;height:100%;background:url('editors/images/grid.gif')">
	</div>
</body>
</html>
